@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@500;700&display=swap');

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #0a0a0a;
  --bg-surface: #111111;
  --bg-surface-2: #1a1a1a;
  --text: #e5e5e5;
  --text-muted: #737373;
  --text-dim: #525252;
  --accent: #8B5CF6;
  --accent-dim: rgba(139, 92, 246, 0.15);
  --border: #1f1f1f;
  --radius: 8px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Grid background pattern */
.grid-bg {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  z-index: 0;
}

/* Layout */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Nav */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(10, 10, 10, 0.8);
  border-bottom: 1px solid var(--border);
}

nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-brand {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-logo {
  height: 36px;
  width: auto;
}

.footer-logo {
  height: 32px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text);
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
}

.hero-badge {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(139, 92, 246, 0.25);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 32px;
  letter-spacing: 0.02em;
}

h1 {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

h1 .accent {
  color: var(--accent);
}

.hero-sub {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  color: var(--text-muted);
  max-width: 560px;
  margin-bottom: 48px;
  line-height: 1.5;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
  font-family: 'Inter', sans-serif;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: #7C4DEF;
  box-shadow: 0 0 24px rgba(139, 92, 246, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: #333;
  color: var(--text);
}

/* Sections */
section {
  padding: 120px 0;
}

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

h2 {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 520px;
  margin-bottom: 56px;
}

/* How it works */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.step {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 28px;
  transition: border-color 0.2s;
}

.step:hover {
  border-color: #333;
}

.step-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 16px;
}

.step h3 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.step p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.kbd {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  background: var(--bg-surface-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
  color: var(--text);
}

/* Flow diagram */
.flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 48px;
  flex-wrap: wrap;
}

.flow-item {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  padding: 10px 18px;
  border-radius: var(--radius);
}

.flow-arrow {
  color: var(--text-dim);
  font-size: 0.8rem;
}

/* Download */
.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.download-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 24px;
  text-align: center;
  text-decoration: none;
  color: var(--text);
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.download-card:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.download-card .os-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--bg-surface-2);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--text-muted);
}

.download-card .os-name {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 0.95rem;
}

.download-card .os-detail {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Use Cases */
.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

.use-case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  transition: border-color 0.2s;
}

.use-case-card:hover {
  border-color: var(--accent);
}

.use-case-icon {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.use-case-card h3 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.use-case-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.price-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
}

.price-card.featured {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(139, 92, 246, 0.06) 0%, var(--bg-surface) 100%);
}

.price-tier {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.price-card.featured .price-tier {
  color: var(--accent);
}

.price-amount {
  font-family: 'JetBrains Mono', monospace;
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.price-amount span {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

.price-desc {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 28px;
}

.price-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 32px;
  flex: 1;
}

.price-features li {
  font-size: 0.875rem;
  color: var(--text-muted);
  padding-left: 20px;
  position: relative;
}

.price-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 7px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.btn-block {
  width: 100%;
  justify-content: center;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 48px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 12px;
}

.footer-brand {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.8rem;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--text);
}

.footer-copy {
  color: var(--text-dim);
  font-size: 0.75rem;
  margin-top: 24px;
}

/* Auth pages */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.auth-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 48px 40px;
  max-width: 400px;
  width: 100%;
  text-align: center;
}

.auth-card h1 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.auth-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 32px;
}

.input-group {
  margin-bottom: 16px;
}

.input-group input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.9rem;
  font-family: 'Inter', sans-serif;
  outline: none;
  transition: border-color 0.2s;
}

.input-group input:focus {
  border-color: var(--accent);
}

.input-group input::placeholder {
  color: var(--text-dim);
}

.auth-message {
  margin-top: 24px;
  padding: 16px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  display: none;
}

.auth-message.success {
  display: block;
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.2);
  color: #22c55e;
}

.auth-message.error {
  display: block;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: #ef4444;
}

/* OAuth buttons */
.oauth-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.btn-github {
  background: #24292e;
  color: #fff;
}

.btn-github:hover {
  background: #2f363d;
}

.btn-google {
  background: #fff;
  color: #3c4043;
  border: 1px solid #dadce0;
}

.btn-google:hover {
  background: #f8f9fa;
}

.divider {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
  color: var(--text-dim);
  font-size: 0.8rem;
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.auth-back {
  display: inline-block;
  margin-top: 24px;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-decoration: none;
  transition: color 0.2s;
}

.auth-back:hover {
  color: var(--text);
}

.spinner {
  display: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin: 24px auto 0;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero {
    padding: 100px 24px 60px;
  }

  .steps,
  .download-grid,
  .pricing-grid,
  .use-cases-grid {
    grid-template-columns: 1fr;
  }

  .flow {
    flex-direction: column;
  }

  .flow-arrow {
    transform: rotate(90deg);
  }

  .footer-inner {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }

  .auth-card {
    padding: 32px 24px;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta .btn {
    width: 100%;
    justify-content: center;
  }
}